Some of the workmen attempted to reach the scene of the fire, but were driven back by the dense and suffocating smoke, impregnated with vapours. Endeavours were made to smother the fire, but though the mine remained closed for five weeks, no sooner was it re-opened than the fire burst forth more furiously than at first. The howling of the flames ascending from the lowest depths of the pit awed the spectators, and the mercurial and sulphureous fumes arising from it threatened instant destruction to all who might approach. The director of the mine, as a last resource, came to the decision of flooding the works, and a river turned into the shaft ran down it for two days and three nights. At first no perceptible effect was produced, but on the second a terrific explosion shook the mountain as if an earthquake had taken place. The huts near the opening were blown to pieces, and even the stone houses on the slopes of the hill, fell with tremendous crashes. Water, however, gained the victory. Gradually the vapour dispersed, and after a few weeks the workmen were able to descend into the pit. They found, however, the galleries torn up, the vaulted roofs burst, and the stairs destroyed. It took two years to pump out the water, which, it is said, poisoned all the fish in the Idriza. High pay being offered to any who would venture in to collect the quicksilver, which had accumulated in considerable quantities, many, tempted by the bribe, made their way into the workings, but overcome by the mercurial vapours, several perished. The galleries have now been formed of stone, seven feet high and six feet broad, though some are still propped up with wood. They are of immense extent, amounting to no less than fifty miles. As late as 1846 another fire occurred in the wooden galleries, which was quenched by putting that part under water. The workmen labour in a tropical heat and an atmosphere full of deadly vapours. It is no wonder that a premature age overtakes many of them, and that young men are seen trembling in every limb, though it is said that those who survive their forty-fifth year may live on until they are sixty or seventy. To transport mercury, the greatest care is required. It is first packed in sacks of sheepskin, tanned with alum. The sack, being pressed and punched to ascertain if it is sound, is enclosed in a second skin. These are then placed in a small cask, and the cask again in a square box. Notwithstanding these precautions, as the sacks sometimes burst, the loss of the metal is great, and the mercury is now generally transported in large iron bottles, the stoppers being screwed down by means of a machine; in this condition, it is exported to England. CHAPTER SEVEN. STALACTITE AND ICE-CAVERNS. Numberless and varied are the cavernous regions below the earth, presenting the strangest and often awe-inspiring sights to the spectator. In some rivers flow hundreds of feet beneath the green fields and widespreading trees.